Mass Polymorph 
Sorcery
$0.20 #10152 0.12 16.3 years
Exile all creatures you control, then reveal cards from the top of your library until you reveal that many creature cards. Put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library.
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Cards similar to Mass Polymorph expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Synthetic Destiny94%
$0.19↓#97430.1210.9 years↓
"Exile all creatures you control. At the beginning of the next end step, reveal cards from the top of your library until you reveal that many creature cards, put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library."
Collision of Realms90%
$0.27↑#16323↓0.68↑4.7 years↓
"Each player shuffles all creatures they own into their library. Each player who shuffled a nontoken creature into their library this way reveals cards from the top of their library until they reveal a creature card, then puts that card onto the battlefield and the rest on the bottom of their library in a random order."
Transmogrify87%
$0.40↑#102620.55↑6.3 years↓
"Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library."
Divergent Transformations86%
$1.30↑#83510.079.9 years↓
"Exile two target creatures. For each of those creatures, its controller reveals cards from the top of their library until they reveal a creature card, puts that card onto the battlefield, then shuffles the rest into their library."
Fireflux Squad86%
$0.32↑#13948↓0.28↑6.5 years↓
"Whenever this creature attacks, you may exile another target attacking creature you control. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield tapped and attacking and the rest on the bottom of your library in a random order."
Blessed Reincarnation85%
$0.14↓#21729↓0.1011.6 years↓
"Exile target creature an opponent controls. That player reveals cards from the top of their library until a creature card is revealed. The player puts that card onto the battlefield, then shuffles the rest into their library."
Riptide Shapeshifter84%
$0.25↑#21985↓0.29↑24.0 years↑
"
, Sacrifice this creature: Choose a creature type. Reveal cards from the top of your library until you reveal a creature card of that type. Put that card onto the battlefield and shuffle the rest into your library."
, Sacrifice this creature: Choose a creature type. Reveal cards from the top of your library until you reveal a creature card of that type. Put that card onto the battlefield and shuffle the rest into your library."
Jalira, Master Polymorphist82%
$0.17↓#14532↓0.25↑12.3 years↓
", 
, Sacrifice another creature: Reveal cards from the top of your library until you reveal a nonlegendary creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
, , Sacrifice another creature: Reveal cards from the top of your library until you reveal a nonlegendary creature card. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
Lukka, Coppercoat Outcast80%
$0.64↑#12716↓0.29↑6.5 years↓
"−2: Exile target creature you control, then reveal cards from the top of your library until you reveal a creature card with greater mana value. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
Identity Echo80%
$0.32↑#15220↓0.150.0 years↓
"
: Exile target creature or planeswalker you control. Reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order. Activate only as a sorcery."
: Exile target creature or planeswalker you control. Reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order. Activate only as a sorcery."
Indomitable Creativity79%
$0.52↑#108480.149.7 years↓
"Destroy X target artifacts and/or creatures. For each permanent destroyed this way, its controller reveals cards from the top of their library until an artifact or creature card is revealed and exiles that card. Those players put the exiled cards onto the battlefield, then shuffle."
Chaotic Transformation78%
$0.22↑#118500.064.1 years↓
"Exile up to one target artifact, up to one target creature, up to one target enchantment, up to one target planeswalker, and/or up to one target land. For each permanent exiled this way, its controller reveals cards from the top of their library until they reveal a card that shares a card type with it, puts that card onto the battlefield, then shuffles."
Polymorph78%
$1.47↑#81280.50↑30.0 years↑
"Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into their library."
Shifting Shadow78%
$0.29↑#15103↓0.28↑9.2 years↓
"Enchanted creature has haste and "At the beginning of your upkeep, destroy this creature. Reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and attach this card to it, then put all other cards revealed this way on the bottom of your library in a random order.""
Reality Scramble76%
$0.86↑#94550.138.2 years↓
"Put target permanent you own on the bottom of your library. Reveal cards from the top of your library until you reveal a card that shares a card type with that permanent. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
Proteus Staff76%
$0.35↑#6638↑0.29↑23.0 years↑
", : Put target creature on the bottom of its owner's library. That creature's controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield and the rest on the bottom of their library in any order. Activate only as a sorcery."
, : Put target creature on the bottom of its owner's library. That creature's controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield and the rest on the bottom of their library in any order. Activate only as a sorcery."
Jace, Multiverse Architect76%
$0.94↑#85920.51↑0.0 years↓
"−3: Exile another target planeswalker or creature you control. Reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order."
Empty the Laboratory76%
$1.01↑#6660↑0.50↑5.1 years↓
"Sacrifice X Zombies, then reveal cards from the top of your library until you reveal a number of Zombie creature cards equal to the number of Zombies sacrificed this way. Put those cards onto the battlefield and the rest on the bottom of your library in a random order."
Genesis Storm75%
$0.63↑#12783↓0.78↑8.2 years↓
"Reveal cards from the top of your library until you reveal a nonland permanent card. You may put that card onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield on the bottom of your library in a random order."
Thicket Elemental75%
$0.19↓#20489↓0.38↑26.0 years↑
"When this creature enters, if it was kicked, you may reveal cards from the top of your library until you reveal a creature card. If you do, put that card onto the battlefield and shuffle all other cards revealed this way into your library."